James callan



VJ. CALLAN, METAL TUBING (No Model.)

No. 498,458. y Patented May 30, 1893 UNITED STATES PATENT OFFICE.

JAMES CALLAN, OF WATERBURY, CONNECTICUT, ASSIGNOR TO RANDOLPH da CLOWES,OF SAME PLACE.

METAL TUBING.

SPECIFICATION forming part of Letters Patent No. 498,458, dated May 30,1893. Application filed February 9, 1893. Serial No.461,582. (No model.)

To @ZZ whom it may con/cern:

Be it known that I, JAMES CALLAN, of Vaterbury, in the County of NewHaven and State of Connecticut, have invented a new and usefulImprovement in Metal Tubing, of which the following is a specification.

This invention consists in a metal tube having integral with it orforming parts of it externally projecting ribs which run sinuously inthe direction of its length, such tubes being not only ornamental vbuthaving greater stiffness for certain uses than plain tubes of the sameCaliber and weight.

Figure l represents an external longitudinal view of a piece of tubingconstructed aecording to my invention. Fig. 2 represents a transversesection of the same.

In the example represented the tube A has three sinuous ribs a a arunning lengthwise 2o of it, but the number is immaterial so far as myinvention is considered. The ribs are represented as hollow and theirinteriors form portions of the interior of the tube. Snell tubing may beof any metal but generally I prefer to make it of duotile metal and toproduce its `sinuous ribs by drawing it through a suitable die to whichduring the drawing of the tube directly through it, an oscillatingmovement about its axis is given by any suitable means.

What I claim as my invention, and desire to secure by Letters Patent, is

A metal tube having integral with `it eX- ternal ribs running sinuouslyin the direction of its length, substantially as herein described.

JAMES CALLAN. Witnesses:

FREDK. HAYNEs, CHAS. A, COTTER.

